// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System.Data;
using JetBrains.Annotations;

namespace SnapObjects.Data.Odbc
{
    public class OdbcLongStringTypeMapping : OdbcStringTypeMapping
    {

        /// <summary>
        ///     Initializes a new instance of the <see cref="OdbcStringTypeMapping" /> class.
        /// </summary>
        /// <param name="dbTypeName"> The name of the database type. </param>
        /// <param name="dbType"> The <see cref="DbType" /> to be used. </param>
        /// <param name="unicode"> A value indicating whether the type should handle Unicode data or not. </param>
        /// <param name="size"> The size of data the property is configured to store, or null if no size is configured. </param>
        public OdbcLongStringTypeMapping(
            [NotNull] string dbTypeName,
            [CanBeNull] DbType? dbType,
            bool unicode = false,
            int? size = null)
            : base(dbTypeName, dbType, unicode, size)
        {
            _maxSpecificSize = CalculateSize(unicode, size);
        }
        private static int CalculateSize(bool unicode, int? size)
        {
            return size.HasValue && size < 2147483647 ? size.Value : 2147483647; // 2GB minus 1 (unicode's length is same)
        }

        /// <summary>
        ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
        ///     directly from your code. This API may change or be removed in future releases.
        /// </summary>
        public override TypeMapping Clone(string dbTypeName, int? size)
        {
            return new OdbcLongStringTypeMapping(
                           dbTypeName,
                           this.DbType,
                           this.IsUnicode,
                           size);
        }
    }
}
